From Siviez, walk towards Tortin until you reach the departure of the Bisse de Saxon, the longest bisse in the Valais. The bisse passes through the mountain pastures of Tortin and Siviez and then cuts through the Pine forests on the way to Nendaz.
Departure point the yellow sign at the post-bus stop at Siviez.
You can reach Siviez via shuttle bus from Nendaz. Reservation obligatory until the evening before until 5.30pm at Nendaz Tourisme, +41 27 289 55 89.